What does 'syntax' mean in the context of a programming language?

In the context of a programming language, syntax encompasses the specific set of rules and guidelines that dictate how code must be structured and formatted to be correctly understood and executed by a computer. This includes aspects such as the use of keywords, punctuation, data types, and the overall arrangement of code elements. Adhering to the correct syntax is essential for writing functional programs; if these rules are not followed, the computer will return errors, indicating that it cannot interpret the code.

The other choices offer definitions that do not accurately represent what syntax means in programming. For instance, the speed at which a program runs relates to its efficiency and performance, not its syntax. Similarly, visual design pertains more to the user interface and aesthetics of applications rather than the structural rules governing code. Lastly, while function names are an essential part of programming, they are just one component of syntax and do not embody the full scope of structural rules that syntax covers. Thus, the correct definition of syntax, as a set of rules for structuring programs, is crucial for understanding how programming languages operate.